VERY important request

Im using GoodNotes for about 2 years and I store all my books and stuff for studies there. So it is very crucial for me to sort my notebooks in specific order to find them easily. But in the new version of Goodnotes I can only sort my notebooks by date and name which is VERY inconvenient for me. I beg the developers to return the function of sorting notebooks freely as it is vital for me))
By the way, the rest is good, I like new design of a program in iOS 7 style, and subfolders are great!

Vitas Bulatov about GoodNotes 4, v4.0